One of the risks of the introduction of higher dynamic range is visible banding or contouring in the image. Historically, this EOTF curve in digital cinema was referred to as the ‘ gamma curve’: the shape could be described by a power law, where the exponent was named after the Greek letter gamma with a typical value of 2.6 for cinema, and between 2.2 and 2.4 for television.
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This is exactly what the EOTF does: it tells the projection system how to represent a certain input value. You have to trust in the way he stored his intent in the bit values of the DCP (“pixels that show actor’s suit = (4021, 212, 54)”). Since the director isn’t present in the booth for every screening, he cannot preserve his creative intent live and on the fly (“I want to make the actor’s suit more reddish”). In order to guarantee the creative intent of the director, a standardized translation step is needed. The content is handed over to cinemas in the form of a DCP: the digital cinema package is a digital file – lots of bits – that needs to be loaded into the server, then sent to the projector and finally projected on screen – lots of nits. SMPTE ST2084 EOTFĮOTF stands for ‘Electro Optical Transfer Function’ which basically means “ how do you translate bits into nits?” or “ how do you translate electrons into photons?”. Understanding the UHD Premium definition will help you understand what’s currently under discussion and what might be coming into cinema. It’s only logical that they wanted to leverage this across their content (workflow). This UHD Premium definition put a stick in the sand for content creators – often those same creators that make the movies that are screened in cinemas.
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SMPTE defines it without quantified metrics: “A High Dynamic Range System (HDR System) is specified and designed for capturing, processing, and reproducing a scene, conveying the full range of perceptible shadow and highlight detail, with sufficient precision and acceptable artifacts, including sufficient separation of diffuse white and specular highlights.”
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This is closest we ever got to a specification for HDR in the movie and TV industry. More than 1,000 nits peak brightness and less than 0.05 nits black level (aimed at LCD TV’s) A combination of peak brightness and black level either:.SMPTE ST2084 EOTF (see below for more explanation).This is what makes the ‘UHD Premium’ definition unique. For the first time, the group went beyond resolution only: color gamut, contrast ratio, bit depth etc. The goal was “to bring a new, differentiated entertainment experience that delivers a premium expression of creative intent using next-generation audio‐visual technologies”. Apart from working on standardization and interoperability (focused on TV and BluRay) they identified ‘UHD Premium’ in January 2016 – note that’s it’s not a spec, but a label by the consortium. This industry consortium works on Ultra HD (3840x2160, consumer version of ‘4K’) and has founding members from entertainment, electronics, and technology fields.
To start our story, we need to step away from cinema and go back in time to the activities of the ‘ UHD Alliance’ between 20. We look at the wider eco-system instead: what does it take and who’s involved to get HDR-content on my screen? UHD Premium In this article, we’ll zoom out a bit and won’t focus on the projection aspect. In previous articles, we have tackled the (non)sense of some of the extremely high contrast ratio numbers that are claimed as well as the different angles involved when developing and building a high(er) dynamic range projector.
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